Publication: Numerical investigation of the aerodynamic influence of combustion on the vortex breakdown : with OpenFOAM
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2011-07-07
Defense date
2010-05-07
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Abstract
This work supports the experimental investigation with insights into the aerodynamic interaction of a flame and a swirl flow obtained through numerical simulation of the reacting swirl flow. The goal is first, to gain a greater understanding of the combustion aerodynamics of swirl stabilized flames in general and second, to investigate the aerodynamic influence of a swirl stabilized flame on the shape and the position of the axial recirculation zone. The principal idea of this work is to build a numerical model that gives the opportunity to study the interaction of flow with a free flame and with a flame fixed in space. The purpose of the fixed flame is to identify the pure influence of the flame on the flow without influence of the flow on the flame. The main findings of this work are: First, at a critical level of swirl one can observe a transition between a flame that is mainly stabilized by the axial recirculation zone and a flame that is manly stabilized by the vortex in the “back step” corner of the cross section jump at the entry of the combustion chamber. Second, variations of the thickness, the axial position and the angle of the flame front have indeed an effect on the axial position and the shape of the axial recirculation zone of the swirl flow.
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Combustión, Dinámica de fluidos, Simulación numérica